Datasheet LT8641 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 65V, 3.5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 26 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. … |
| Revision | B |
| File Format / Size | PDF / 3.4 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. EN Pin Thresholds. Load Regulation. Line Regulation. No-Load Supply Current
Model Line for this Datasheet
LT8641
Text Version of Document
LT8641
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds EN Pin Thresholds Load Regulation Line Regulation
1.03 0.15 0.15 VOUT = 5V VOUT = 5V 1.02 VIN = 12V I 0.10 LOAD = 1A 0.10 EN RISING 1.01 (%) 0.05 (%) 0.05 1.00 OUT OUT 0.99 0 0 0.98 –0.05 –0.05 EN THRESHOLD (V) CHANGE IN V CHANGE IN V 0.97 EN FALLING –0.10 –0.10 0.96 0.95 –0.15 –0.15 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 5 15 25 35 45 55 65 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8641 G11 8641 G12 8641 G10
No-Load Supply Current Top FET Current Limit vs Duty Cycle To T p FET Current Limit op FET Current Limit
4.5 8.5 10 VOUT = 3.3V L = 4.7µH 4.0 IN-REGULATION 8.0 9 3.5 7.5 3.0 7.0 8 5% DC 2.5 6.5 INPUT CURRENT (µA) 2.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 7 1.5 6.0 1.0 5.5 6 0 10 20 30 40 50 60 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8641 G13 8641 G14 8641 G15
Switch Drop Switch Drop Minimum On-Time
250 500 43 SWITCH CURRENT = 1A 450 VSYNC = 0 VSYNC = FLOAT 200 400 40 350 37 150 300 250 TOP SWITCH TOP SWITCH 34 100 200 SWITCH DROP (mV) SWITCH DROP (mV) 150 31 MINIMUM ON-TIME (ns) 50 BOTTOM SWITCH 100 BOTTOM SWITCH 28 50 ILOAD = 2A 0 0 25 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8641 G16 8641 G17 8641 G18 Rev A For more information www.analog.com 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS EN Pin Thresholds EN Pin Thresholds Load Regulation Line Regulation
1.03 0.15 0.15 VOUT = 5V VOUT = 5V 1.02 VIN = 12V I 0.10 LOAD = 1A 0.10 EN RISING 1.01 (%) 0.05 (%) 0.05 1.00 OUT OUT 0.99 0 0 0.98 –0.05 –0.05 EN THRESHOLD (V) CHANGE IN V CHANGE IN V 0.97 EN FALLING –0.10 –0.10 0.96 0.95 –0.15 –0.15 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 5 15 25 35 45 55 65 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 8641 G11 8641 G12 8641 G10
No-Load Supply Current Top FET Current Limit vs Duty Cycle To T p FET Current Limit op FET Current Limit
4.5 8.5 10 VOUT = 3.3V L = 4.7µH 4.0 IN-REGULATION 8.0 9 3.5 7.5 3.0 7.0 8 5% DC 2.5 6.5 INPUT CURRENT (µA) 2.0 CURRENT LIMIT (A) CURRENT LIMIT (A) 7 1.5 6.0 1.0 5.5 6 0 10 20 30 40 50 60 0.1 0.3 0.5 0.7 0.9 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE TEMPERATURE (°C) 8641 G13 8641 G14 8641 G15
Switch Drop Switch Drop Minimum On-Time
250 500 43 SWITCH CURRENT = 1A 450 VSYNC = 0 VSYNC = FLOAT 200 400 40 350 37 150 300 250 TOP SWITCH TOP SWITCH 34 100 200 SWITCH DROP (mV) SWITCH DROP (mV) 150 31 MINIMUM ON-TIME (ns) 50 BOTTOM SWITCH 100 BOTTOM SWITCH 28 50 ILOAD = 2A 0 0 25 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 8641 G16 8641 G17 8641 G18 Rev A For more information www.analog.com 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Applications Related Parts
